Preserving block



FIG. 1 is a top perspective view of the preserving block, showing the new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a front end view thereof;

FIG. 5 is a back end view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for a preserving block, as shown and described. 